Specialists from Tomsk Polytechnic University and Gazprom transgaz Tomsk created a technology and equipment for welding main gas pipelines that make it possible to work even on magnetized pipes. The development has already been delivered to the customer and is undergoing testing, TPU reported.
The main problem in gas pipeline repair is residual magnetization and pipe deformation. They complicate joint preparation and the welding process itself. Tomsk scientists proposed a solution: periodic changes in the magnitude and direction of the arc current. This makes it possible to perform welding without additional demagnetization, simplifying and speeding up the process.
The use of amplitude-modulated multidirectional rectangular current pulses makes it possible to rhythmically melt the pipeline edges without overheating or burn-through and forms a high-quality joint. At the same time, the equipment makes it possible to form the root layer of the weld in any spatial position without additional demagnetization before welding.
According to preliminary estimates, the new technology reduces welding time by an average of 20% due to automation and a lower risk of defects. The developers plan to make the unit lighter and more compact for more convenient work in field conditions.